Extract keywords from requested page

It can extract some keywords from a given URL retrieval web page

For example, from the homepage of Code Zhuji, keywords similar to the picture below can be extracted

if(!empty($_REQUEST["url"])){

 include 'class.keywords.php';

 $keywords = new keywordsugest();
 $keywords- >_lang = 'es';
 $keywords->_encoding = 'iso-8859-1';
 $keywords->_catego = 'telecom';
 $keywords->_keyCount = 100; // is like the porcent %
 $keywords->file($_REQUEST['url']);

 #$keywords->readMetaKeyWords();

 #$keywords->readHtmlKeyWords();

 $keywords-> ;readAll();

 echo 'Keywords found :';

 $i = 1;

 foreach($keywords->get() as $word) echo $i++ .". $word";
}
//url For example: http://www.codepearl.com
echo "

";


?>

  class keywordsugest{

        var $_html        =    FALSE;
        var $_keyCount    =    5;
        var $_keyWords    =    array();
        var $_encoding    =    'UTF-8';
        var $_lang        =    'es';
        var $_catego      =    'telecom';
        var $_url         =    '';

        /**
        * # read meta keywords
        *
*/
        public function readMetaKeyWords()    {

            if (! $this->_html) return;

            preg_match('/"]*)"?[s]*[/]?[s]*>/is', $this->_html, $match);

            //$tags = get_meta_tags($this->_url);
            //echo $tags['keywords'];


            if (count($match))    {
                $this->_keyWords = array_unique(explode(',', preg_replace('/s/i', ' ', mb_strtolower($match[1], $this->_encoding))));
            }
        }

       /**
       * strip tags
       *
       * @param mixed $string
*/
       private function rip_tags($string) {

    // ----- remove HTML TAGs -----
    $string = preg_replace ('/]*>/', ' ', $string);

    /* // ----- remove control characters -----
    $string = str_replace("r", '', $string);    // --- replace with empty space
    $string = str_replace("n", ' ', $string);   // --- replace with space
    $string = str_replace("t", ' ', $string);   // --- replace with space
   */
    // ----- remove multiple spaces -----
    $string = trim(preg_replace('/ {2,}/', ' ', $string));

    return $string;

}

        /**
        * # read keywords from page body or string
        *
*/
        public function readHtmlKeyWords()    {

            if (! $this->_html) return;

            if(!empty($this->_keyWords)){
                $implo = implode(' ',$this->_keyWords);
                $this->_html = $this->_html." ".$implo;
                $this->_keyWords = array();
            }

            $this->_html = str_replace(' ',' ', $this->_html);

            # remove unneeded parts
            $toRemove = array('head', 'script', 'style', 'object', 'embed', 'noembed', 'applet', 'noframes', 'noscript');

            foreach ($toRemove as $remove)    $this->_html = preg_replace("/.*?/is", ' ', $this->_html);